Question

If $\theta$ is an acute angle and sin $\theta$ = cos $\theta$ , find the value of $2ta{n}^2\theta +si{n}^2\theta -1$

• A.
  
• B.
  
• C.
  
• D.
  

Answer 1

The correct option is A

Since $sin\theta =cos\theta$
$\Rightarrow tan\theta =1$
So, $\theta ={45}^{\circ }$, substituting the value of $\theta$, we will get $\frac{3}{2}$